Let be a positive increasing function with . Then
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Let f ( x ) = ln ( x ) as an example. This gives lim x → ∞ ln ( x ) ln ( 3 x ) = lim x → ∞ ln ( x ) ln ( 3 ) + ln ( x ) = lim x → ∞ ln ( x ) ln ( 3 ) + 1 = 1 . By the same approach:
lim x → ∞ ln ( x ) ln ( 2 x ) = lim x → ∞ ln ( x ) ln ( 2 ) + 1 = 1 .